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<?php |
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/** |
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* This file is part of the Rate Limit package. |
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* |
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* Copyright (c) Nikola Posa |
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* |
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* For full copyright and license information, please refer to the LICENSE file, |
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* located at the package root folder. |
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*/ |
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declare(strict_types=1); |
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namespace RateLimit\Middleware; |
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use RateLimit\Exception\RateLimitExceededException; |
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use RateLimit\RateLimiterInterface; |
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use RateLimit\Middleware\Identity\IdentityResolverInterface; |
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use RateLimit\Middleware\Identity\IpAddressIdentityResolver; |
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use Psr\Http\Message\RequestInterface; |
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use Psr\Http\Message\ResponseInterface; |
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/** |
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* @author Nikola Posa <[email protected]> |
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*/ |
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final class RateLimitMiddleware |
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{ |
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const LIMIT_EXCEEDED_HTTP_STATUS_CODE = 429; //HTTP 429 "Too Many Requests" (RFC 6585) |
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const HEADER_LIMIT = 'X-RateLimit-Limit'; |
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const HEADER_REMAINING = 'X-RateLimit-Remaining'; |
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const HEADER_RESET = 'X-RateLimit-Reset'; |
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/** |
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* @var RateLimiterInterface |
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*/ |
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private $rateLimiter; |
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/** |
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* @var IdentityResolverInterface |
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*/ |
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private $identityResolver; |
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/** |
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* @var Options |
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*/ |
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private $options; |
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/** |
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* @var string |
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*/ |
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private $identity; |
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public function __construct(RateLimiterInterface $rateLimiter, IdentityResolverInterface $identityResolver, Options $options) |
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{ |
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$this->rateLimiter = $rateLimiter; |
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$this->identityResolver = $identityResolver; |
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$this->options = $options; |
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} |
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public static function createDefault(RateLimiterInterface $rateLimiter, array $options = []) |
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{ |
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return new self( |
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$rateLimiter, |
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new IpAddressIdentityResolver(), |
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Options::fromArray($options) |
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); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function __invoke(RequestInterface $request, ResponseInterface $response, callable $out = null) |
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{ |
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if ($this->isWhitelisted($request)) { |
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return $this->next($request, $response, $out); |
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} |
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$this->identity = $this->resolveIdentity($request); |
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try { |
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$this->rateLimiter->hit($this->identity); |
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return $this->onBelowLimit($request, $response, $out); |
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} catch (RateLimitExceededException $ex) { |
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return $this->onLimitExceeded($request, $response); |
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} |
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} |
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private function isWhitelisted(RequestInterface $request) : bool |
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{ |
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$whitelist = $this->options->getWhitelist(); |
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return $whitelist($request); |
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} |
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private function resolveIdentity(RequestInterface $request) : string |
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{ |
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return $this->identityResolver->getIdentity($request); |
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} |
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private function onLimitExceeded(RequestInterface $request, ResponseInterface $response) : ResponseInterface |
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{ |
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$response = $this |
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->setRateLimitHeaders($response) |
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->withStatus(self::LIMIT_EXCEEDED_HTTP_STATUS_CODE) |
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; |
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$limitExceededHandler = $this->options->getLimitExceededHandler(); |
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$response = $limitExceededHandler($request, $response); |
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return $response; |
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} |
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private function onBelowLimit(RequestInterface $request, ResponseInterface $response, callable $out = null) : ResponseInterface |
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{ |
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$response = $this->setRateLimitHeaders($response); |
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return $this->next($request, $response, $out); |
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} |
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private function next(RequestInterface $request, ResponseInterface $response, callable $out = null) |
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{ |
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return $out ? $out($request, $response) : $response; |
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} |
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private function setRateLimitHeaders(ResponseInterface $response) : ResponseInterface |
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{ |
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return $response |
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->withHeader(self::HEADER_LIMIT, (string) $this->rateLimiter->getLimit()) |
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->withHeader(self::HEADER_REMAINING, (string) $this->rateLimiter->getRemainingAttempts($this->identity)) |
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->withHeader(self::HEADER_RESET, (string) $this->rateLimiter->getResetAt($this->identity)) |
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; |
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} |
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} |
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nikolaposa /
rate-limit
